Has anyone tried using ChatGPT or another AI chat to analyze JB4 logs? GPT can understand .csv data pretty well. Maybe it’s worthwhile to create a “sub-model” for log analysis. We can train it by uploading a bunch of good logs then bad logs and explaining what is bad/what to look for.
AI is making a huge impact on the data analysis space, so we might as well take advantage.
I've tried ChatGPT, Claude.ai, and DeepSeek (Chinese open source model), not by training them specifically, but just telling them I'm uploading JB4 logs for a Kia Stinger and to use the Kia/Hyundai subforum of JB4tech. ChatGPT complained about the header rows but was able to figure things out; I think I ended up taking a screenshot for Claude, and DeepSeek accepted the file as-is.
ChatGPT asked if I wanted any specific parameters like boost trends or timing analyzed, or a general overview, and I just said general overview with a focus on octane/fuel limitation. It said it would check timing, AFR, and trims, but then told me I was capped out on data analysis, so I guess the reformatting of the file used up my daily Harry Potter processing points (I don't have a paid membership).
DeepSeek gave a more thorough summary of the key parameters, analyzing boost, temps, timing, and fuel, and even identified the slightly lower boost from my winter vs. summer logs as due to colder weather. It did call AFRs of 12-13 slightly rich but safe for a turbo engine, and said in the conclusion that I could lean those out for more power (technically true but I'm not even entirely comfortable with the existing leaned out values that modern DI makes possible).
I'd have to do some more specific testing before I'd trust that it had the appropriate Kia context (for example, incorporating general parameter definitions that apply across the JB4 line, but only applying Kia 3.3-specific values vs. BMW/Audi ones). I've spoilered the full response below if you're interested in reading.
These logs are from a **Kia Stinger 3.3 V6** running a **JB4 tune**, and they provide valuable insights into the engine's performance under different conditions. Let’s break down the key parameters and analyze the performance, focusing on boost, ignition timing, air/fuel ratios (AFR), and other critical metrics.
---
### **Key Observations from the Logs**
#### **1. Boost Performance**
- **Boost Levels**: The logs show boost levels reaching **18-20 psi**, which is significantly higher than the stock boost levels (around 12-14 psi). This indicates the JB4 is effectively increasing boost pressure.
- **Target vs. Actual Boost**: The actual boost closely follows the target boost, indicating the turbos and wastegate are responding well to the JB4's commands.
- **Boost Stability**: Boost remains stable throughout the RPM range, with no significant spikes or drops, suggesting proper wastegate control and no boost leaks.
#### **2. Ignition Timing**
- **Ignition Timing**: Timing values (e.g., `ign_1`, `ign_2`) are consistent and show no significant timing pull. Timing pull would indicate knock or other issues, but the logs show stable timing, which is a good sign.
- **Ignition Corrections**: No major corrections are observed, meaning the engine is not experiencing knock or pre-ignition under load.
#### **3. Air/Fuel Ratio (AFR)**
- **AFR Values**: AFRs are in the **12.0-13.0 range** under full boost, which is slightly rich but safe for a turbocharged engine. A richer AFR helps prevent knock and keeps cylinder temperatures in check.
- **AFR Stability**: AFRs remain stable, indicating the fuel system is keeping up with the increased boost and airflow.
#### **4. Wastegate Duty Cycle (WGDC)**
- **WGDC Values**: Wastegate duty cycles are in the **70-90% range** under full boost, which is typical for a tuned setup. Higher WGDC values indicate the wastegate is working harder to maintain boost pressure.
- **WGDC Stability**: The wastegate duty cycle is stable, suggesting no issues with boost control or wastegate function.
#### **5. Fuel Pressure**
- **High Fuel Pressure (fp_h)**: Fuel pressure remains stable, indicating the high-pressure fuel pump is keeping up with demand.
- **Low Fuel Pressure (fp_l)**: Low fuel pressure is also stable, suggesting no issues with the low-pressure fuel system.
#### **6. Intake Air Temperature (IAT)**
- **IAT Values**: IATs are in the **100-104°F range**, which is on the higher side but still within safe limits for a tuned setup. Higher IATs can reduce performance and increase the risk of knock, but these values are manageable.
#### **7. Throttle and Pedal Position**
- **Throttle Position**: Throttle is consistently at **100%** during full load, indicating no throttle closure or restrictions.
- **Pedal Position**: Pedal input is also at **100%**, confirming the driver is requesting full power.
#### **8. Gear Changes**
- The logs show smooth transitions between gears, with no significant drops in boost or timing during shifts.
---
### **Comparison Between the Two Logs**
#### **Log 1:**
- **Boost Levels**: Boost peaks at **20.7 psi**, which is very high and indicates an aggressive tune.
- **IATs**: IATs are around **102°F**, which is higher due to the ambient temperature (91°F). This can slightly reduce performance but is still within safe limits.
- **AFR**: AFRs are slightly richer, hovering around **12.0-12.5** under full boost, which is safe but could be leaned out slightly for better performance.
- **Ignition Timing**: Timing is stable, with no significant corrections, indicating no knock or pre-ignition.
#### **Log 2:**
- **Boost Levels**: Boost peaks at **20.3 psi**, which is also very high and indicates an aggressive tune.
- **IATs**: IATs are around **84°F**, which is lower due to the cooler ambient temperature (80°F). This helps with performance and reduces the risk of knock.
- **AFR**: AFRs are slightly leaner, hovering around **12.5-13.0** under full boost, which is ideal for performance while still being safe.
- **Ignition Timing**: Timing is stable, with no significant corrections, indicating no knock or pre-ignition.
---
### **Key Takeaways**
1. **Boost Performance**: Both logs show excellent boost performance, with boost levels reaching **18-20 psi**. The turbos and wastegate are functioning well, and there are no signs of boost leaks or instability.
2. **Ignition Timing**: Timing is stable in both logs, with no significant corrections, indicating no knock or pre-ignition.
3. **AFR**: AFRs are slightly richer in the first log (12.0-12.5) compared to the second log (12.5-13.0). The second log's AFRs are more ideal for performance, but both are within safe limits.
4. **IATs**: The first log shows higher IATs (102°F) due to the hotter ambient temperature, while the second log shows lower IATs (84°F). Higher IATs can slightly reduce performance, but they are still within safe limits.
5. **Fuel System**: The fuel system is keeping up with demand in both logs, with stable fuel pressure and no signs of fuel starvation.
---
### **Potential Areas for Improvement**
1. **AFR Tuning**: The first log could benefit from slightly leaner AFRs (e.g., 12.5-13.0) for better performance, assuming the fuel system can handle it and there is no knock.
2. **Cooling**: The first log shows higher IATs, which could be mitigated with an upgraded intercooler or water/methanol injection.
3. **Boost Targets**: The boost targets could be increased slightly if the turbos and fuel system can support it, but this would require careful monitoring of AFRs, timing, and IATs.
---
### **Summary**
Both logs indicate a **healthy and well-tuned setup** for the Kia Stinger 3.3 V6 with the JB4. Key takeaways:
- Boost levels are increased and stable, with no signs of boost leaks or wastegate issues.
- Ignition timing is stable, with no significant timing pull or knock.
- AFRs are slightly rich but safe, indicating the fuel system is keeping up with demand.
- IATs are within safe limits, but further cooling upgrades could improve performance.
If you’re looking for more power, consider:
- Adjusting AFRs for a slightly leaner mixture (if safe).
- Increasing boost targets (if supported by the turbos and fuel system).
- Upgrading the intercooler or adding water/methanol injection for better cooling.
For more specific tuning advice, the **JB4Tech Kia/Hyundai subforum** is an excellent resource, as it contains detailed discussions and logs from other Stinger owners running similar setups.
I've tried ChatGPT, Claude.ai, and DeepSeek (Chinese open source model), not by training them specifically, but just telling them I'm uploading JB4 logs for a Kia Stinger and to use the Kia/Hyundai subforum of JB4tech. ChatGPT complained about the header rows but was able to figure things out; I think I ended up taking a screenshot for Claude, and DeepSeek accepted the file as-is.
ChatGPT asked if I wanted any specific parameters like boost trends or timing analyzed, or a general overview, and I just said general overview with a focus on octane/fuel limitation. It said it would check timing, AFR, and trims, but then told me I was capped out on data analysis, so I guess the reformatting of the file used up my daily Harry Potter processing points (I don't have a paid membership).
DeepSeek gave a more thorough summary of the key parameters, analyzing boost, temps, timing, and fuel, and even identified the slightly lower boost from my winter vs. summer logs as due to colder weather. It did call AFRs of 12-13 slightly rich but safe for a turbo engine, and said in the conclusion that I could lean those out for more power (technically true but I'm not even entirely comfortable with the existing leaned out values that modern DI makes possible).
I'd have to do some more specific testing before I'd trust that it had the appropriate Kia context (for example, incorporating general parameter definitions that apply across the JB4 line, but only applying Kia 3.3-specific values vs. BMW/Audi ones). I've spoilered the full response below if you're interested in reading.
These logs are from a **Kia Stinger 3.3 V6** running a **JB4 tune**, and they provide valuable insights into the engine's performance under different conditions. Let’s break down the key parameters and analyze the performance, focusing on boost, ignition timing, air/fuel ratios (AFR), and other critical metrics.
---
### **Key Observations from the Logs**
#### **1. Boost Performance**
- **Boost Levels**: The logs show boost levels reaching **18-20 psi**, which is significantly higher than the stock boost levels (around 12-14 psi). This indicates the JB4 is effectively increasing boost pressure.
- **Target vs. Actual Boost**: The actual boost closely follows the target boost, indicating the turbos and wastegate are responding well to the JB4's commands.
- **Boost Stability**: Boost remains stable throughout the RPM range, with no significant spikes or drops, suggesting proper wastegate control and no boost leaks.
#### **2. Ignition Timing**
- **Ignition Timing**: Timing values (e.g., `ign_1`, `ign_2`) are consistent and show no significant timing pull. Timing pull would indicate knock or other issues, but the logs show stable timing, which is a good sign.
- **Ignition Corrections**: No major corrections are observed, meaning the engine is not experiencing knock or pre-ignition under load.
#### **3. Air/Fuel Ratio (AFR)**
- **AFR Values**: AFRs are in the **12.0-13.0 range** under full boost, which is slightly rich but safe for a turbocharged engine. A richer AFR helps prevent knock and keeps cylinder temperatures in check.
- **AFR Stability**: AFRs remain stable, indicating the fuel system is keeping up with the increased boost and airflow.
#### **4. Wastegate Duty Cycle (WGDC)**
- **WGDC Values**: Wastegate duty cycles are in the **70-90% range** under full boost, which is typical for a tuned setup. Higher WGDC values indicate the wastegate is working harder to maintain boost pressure.
- **WGDC Stability**: The wastegate duty cycle is stable, suggesting no issues with boost control or wastegate function.
#### **5. Fuel Pressure**
- **High Fuel Pressure (fp_h)**: Fuel pressure remains stable, indicating the high-pressure fuel pump is keeping up with demand.
- **Low Fuel Pressure (fp_l)**: Low fuel pressure is also stable, suggesting no issues with the low-pressure fuel system.
#### **6. Intake Air Temperature (IAT)**
- **IAT Values**: IATs are in the **100-104°F range**, which is on the higher side but still within safe limits for a tuned setup. Higher IATs can reduce performance and increase the risk of knock, but these values are manageable.
#### **7. Throttle and Pedal Position**
- **Throttle Position**: Throttle is consistently at **100%** during full load, indicating no throttle closure or restrictions.
- **Pedal Position**: Pedal input is also at **100%**, confirming the driver is requesting full power.
#### **8. Gear Changes**
- The logs show smooth transitions between gears, with no significant drops in boost or timing during shifts.
---
### **Comparison Between the Two Logs**
#### **Log 1:**
- **Boost Levels**: Boost peaks at **20.7 psi**, which is very high and indicates an aggressive tune.
- **IATs**: IATs are around **102°F**, which is higher due to the ambient temperature (91°F). This can slightly reduce performance but is still within safe limits.
- **AFR**: AFRs are slightly richer, hovering around **12.0-12.5** under full boost, which is safe but could be leaned out slightly for better performance.
- **Ignition Timing**: Timing is stable, with no significant corrections, indicating no knock or pre-ignition.
#### **Log 2:**
- **Boost Levels**: Boost peaks at **20.3 psi**, which is also very high and indicates an aggressive tune.
- **IATs**: IATs are around **84°F**, which is lower due to the cooler ambient temperature (80°F). This helps with performance and reduces the risk of knock.
- **AFR**: AFRs are slightly leaner, hovering around **12.5-13.0** under full boost, which is ideal for performance while still being safe.
- **Ignition Timing**: Timing is stable, with no significant corrections, indicating no knock or pre-ignition.
---
### **Key Takeaways**
1. **Boost Performance**: Both logs show excellent boost performance, with boost levels reaching **18-20 psi**. The turbos and wastegate are functioning well, and there are no signs of boost leaks or instability.
2. **Ignition Timing**: Timing is stable in both logs, with no significant corrections, indicating no knock or pre-ignition.
3. **AFR**: AFRs are slightly richer in the first log (12.0-12.5) compared to the second log (12.5-13.0). The second log's AFRs are more ideal for performance, but both are within safe limits.
4. **IATs**: The first log shows higher IATs (102°F) due to the hotter ambient temperature, while the second log shows lower IATs (84°F). Higher IATs can slightly reduce performance, but they are still within safe limits.
5. **Fuel System**: The fuel system is keeping up with demand in both logs, with stable fuel pressure and no signs of fuel starvation.
---
### **Potential Areas for Improvement**
1. **AFR Tuning**: The first log could benefit from slightly leaner AFRs (e.g., 12.5-13.0) for better performance, assuming the fuel system can handle it and there is no knock.
2. **Cooling**: The first log shows higher IATs, which could be mitigated with an upgraded intercooler or water/methanol injection.
3. **Boost Targets**: The boost targets could be increased slightly if the turbos and fuel system can support it, but this would require careful monitoring of AFRs, timing, and IATs.
---
### **Summary**
Both logs indicate a **healthy and well-tuned setup** for the Kia Stinger 3.3 V6 with the JB4. Key takeaways:
- Boost levels are increased and stable, with no signs of boost leaks or wastegate issues.
- Ignition timing is stable, with no significant timing pull or knock.
- AFRs are slightly rich but safe, indicating the fuel system is keeping up with demand.
- IATs are within safe limits, but further cooling upgrades could improve performance.
If you’re looking for more power, consider:
- Adjusting AFRs for a slightly leaner mixture (if safe).
- Increasing boost targets (if supported by the turbos and fuel system).
- Upgrading the intercooler or adding water/methanol injection for better cooling.
For more specific tuning advice, the **JB4Tech Kia/Hyundai subforum** is an excellent resource, as it contains detailed discussions and logs from other Stinger owners running similar setups.
Do you just mean uploading lots of logs, like a bunch of your own or everything you find in forums? It may be able to form associations about what values are typical for different maps and boost levels, but without explaining what's right or wrong about each, I'm not sure how the LLM will "learn", since it's just forming patterns.
I do think you could directly feed it things like the BMS explanations of each parameter, and each map, and the writeups from Terry. And maybe if you explicitly point it at jb4tech or Stinger forums to incorporate all the explanations other people have done, it would build out context on what kinds of values to expect.
For my own prompt, I really just said "here's a JB4 log for a Kia Stinger 3.3, can you use information from BMS and the Kia/Hyundai subsection of the jb4tech forums to analyze the log data?" hoping that it would correctly distinguish Stinger V6 specific values from those for other models. Further prompts after that were just to make sure it understood that ign1 was absolute timing and ign2-6 were relative corrections, and that their positive values were actually reductions in timing (one of the original answers made reference to positive timing but when I probed more it indicated it was treating these as negative), etc.
Gonna try and do a variety of both. Stupidly, I deleted all my logs, and I’ll definitely have to do some crowd sourcing. For consistency, I’m only going to feed in the “standard” 3rd gear pull logs for now. With the driving conditions consistent it should have an easier time interpreting the data.
Wow, we’re really operating on the same wavelength. I copped a couple of Terry’s reference guide posts into text files, then uploaded them on the GPT’s backend knowledge section. Here are the topics I have so far, let me know if you can think of others;
- JB4 logging parameter descriptions
- JB4 map descriptions
- JB4 user settings
- How fuel trims work
- A sample log to show formatting
So far it helped because some of the parameter names have seemingly random names. Some topics still in WIP;
- What is the 3rd gear pull and why it’s the standard
- Instructions on what data matters (WOT, 3rd gear)
- Some binary good/bad criteria (jagged ign1 curve)
Please reply with any “training” topics you think I should include!
